Integrated g−i color, in mag, as function of absolute r-band luminosity, log(L_r) in L_⊙, both corrected for Galactic extinction following Schlegel et al. (1998). Nançay detections, marginals, and non-detections are represented by gray dots, open gray circles, and open red circles respectively. Arecibo detections, marginals, and non-detections are respectively represented by black solid stars, open stars, and blue downward triangles. The low luminosity end (log(L_r) <9) shows a color dichotomy with Hi detections and non-detections clustering around g−i ~ 0.4 and g−i ~ 0.8 respectively, showing a clear distinction between the blue cloud and red sequence galaxies. Above luminosities of log(L_r) ~ 9.5, the blue cloud disappears while the red sequence galaxies shift to redder colors, g−i ~ 1.2.